#include <bits/stdc++.h>
// #include <atcoder/all>
using namespace std;
// using namespace atcoder;
typedef int64_t lint;
#define rep(i, n) for(lint i=0; i<n; i++)
#define repx(i, l, n) for(lint i=l; i<n; i++)
#define all(v) v.begin(), v.end()
#define show(x) cout << #x << ": " << x << endl;
#define list(x) cout << #x << ": " << x << "  ";
#define pb push_back
using vi = vector<lint>;
using vvi = vector<vector<lint>>;
template<class T> inline void vin(vector<T>& v) { rep(i, v.size()) cin >> v.at(i); }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> inline void drop(T x) { cout << x << endl; exit(0); }
template<class T> void vout(vector<T> v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; }
constexpr lint LINF = LLONG_MAX/2;
using pint = pair<lint, lint>;
using vp = vector<pint>;

int main() {
	lint N;
	cin >> N;
	vi v(N), w(N);
	vin(v);
	vin(w);

	lint a=0, b=0, c=0, x, y, z;
	set<pint> s, t;
	s.insert({v[0]-w[0], 0});
	t.insert({-v[0]-w[0], 0});
	vi u(N, N-1);
	repx(i, 1, N) {
		vp q;
		for (auto p : s) {
			tie(x, y) = p;
			if (x+w[i] < v[i]) break;
			q.pb({x, y});
			chmin(u[y], i-1);
		}
		for (auto p : q) {
			s.erase(p);
		}
		vp r;
		for (auto p : t) {
			tie(x, y) = p;
			if (-x < v[i]+w[i]) break;
			r.pb({x, y});
			chmin(u[y], i-1);
		}
		for (auto p : r) {
			s.erase(p);
		}
	}
	for (int i = N-1; i > 0; i--) {
		chmin(u[i-1], u[i]);
	}
	// vout(u);
	rep(i, N) {
		a += u[i]-i;
	}
	std::cout << a << '\n';
}